Shoe sewing machine



sept. 19, 1939.

SHOE SEWING MACHINE Original Filed April 29, 1936 6 Sheets-Sheet lv fr FZ?! mventor wm @y attorneys o. R. HAAs 2,173,299

. R. HAAs sepuls, 1939.

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SHOE SEWING MACHINE Original Filed Apvzl 29, 1936 6 Shets-Sheet 6 O O ab 30 nventox:

lPatented Sept. 19, 1939 Uhii'i'D STATES PATENT OFFICE SHOE SEWING MACHINE Original application April 29, 1936, Serial No.

76,924. Divided and this application April 6,

1938, Serial N0. 200,412

7 Claims.

The present invention is concerned with improvements in sewing machines, and relates more particularly to work feeding mechanism especially, but by no means exclusively adapted for use in shoe sewing machines of the type employed to stitch the outsole to the welted upper. Such a machine is illustrated and described in the present inventors pending application Serial No. 76,924 of which the present application is a division.

The principal object of the invention is to provide novel and improved work feed actuating and controlling mechanism adapted for use in sewing machines of the continuous feed type.

Another object of the invention is to provide an improved feed carriage mounting adapted for use in sewing machines of both the intermittent and the continuous feed types which makes possible a reduction in weight of the moving parts and likewise eliminates all tendency of the carriage to bind during the feeding movement thereof due to frictional resistance.

With these and other objects in view, a feature of the present invention consists in the provision in a shoe sewing machine of the continuous feed type in which the work is fed partly by a feed carriage and partly by reciprocation of the needle and awl in the line of feed, of mechanisms for reciprocating the feed carriage and the needle and awl, and adjusting means common to the reciprocating mechanisms for changing simultaneously the feeding movements of the carriage and of the needle and awl.

Another feature of the invention consists in :the provision in a sewing machine of a work feeding carriage mounted for reciprocatory movement in the line of feed, the mounting means including a link extending substantially at right angles to the direction of feed and pivotally con- 40; nected at one end to the machine frame and at the other to the feed carriage.

Other objects and features will become apparent from the following description, taken in conjunction with the accompanying drawings in which Figure 1 is a View in right side elevation of the head portion of a shoe sewing machine embodying the invention and illustrating the control handle and certain of the connections for changing the rate of feed; Figure 2 is a view in rear elevation of the machine head broken away and shown partly in section; Figure 3 is a sectional plan view of the head of the machine with the enclosing covers removed, showing the feed actuating and controlling mechanism; Fig- 55., ure 4 is a sectional View in left side elevation of a portion of the head of the machine; Figure 5 is a detail sectional View, looking from the left, of a portion of the machine illustrated in Figure 4, showing the needle feed mechanism; Figure 6 is a detail view in front elevation, on an enlarged scale and partly in section, of the feed carriage and needle stud and associated mechanism; and Figure 7 is a detail sectional view of the feed carriage and needle stud, and showing the feed carriage supporting link.

The stitch forming and work feeding devices of the lockstitch shoe sewing machine in which the present invention is illustrated as embodied are located in the head portion S of the machine frame, and are actuated from a main sewing cam shaft I0 which is driven by a belt l2 from a driving motor, not shown, at the base of the machine. The driving and stopping mechanism, similar to that illustrated and described in the inventors U. S. Patent No. 2,078,942 of May 4, 1937, is controlled by the usual foot treadle, not illustrated.

The stitch forming and Work feeding devices of the machine include a curved hook needle Hi, a curved awl i6, a loop taker i8 within a circular guideway of which is mounted a thread case 2li, a looper 22, a thread linger 2li, main and auxiliary take-ups 26 and 28, a presser foot 30 and a work support 32.

The work feeding devices of the machine are varranged to feed the work continuously by alternating feeding movements of the work support and presser foot as a unit when the work is clamped, and of the needle as a unit while engaging the work and during the back-'feeding movement of the work support and presser foot.

To permit the presser foot 3G and work support v 32 to be reciprocated in the line of feed, they are mounted upon a laterally sliding carriage 34, best illustrated in Figures 6 and '7. The carriage is provided with hollow gudgeons 3S and SB eX- tending horizontally in axial alinement in opposite directions from the carriage adjacent the central portion thereof and supported for sliding movement in cylindrical guideways lill and t2 in the machine frame. The gudgeon B is formed integrally with the carriage St, while the gudgeon 38 is secured to the carriage by means of a flange 44 fastened tc the inside wall of the carriage, as shown in Fig. 7.

The presser foot 30 is secured to the outer end of a presser foot lever 46 pivotally mounted at its rearward end on a horizontal sleeve d8. The sleeve is secured at one end in the body of the carriage 34 by set screw 5u, and is supported at its other end by a link 52 rigidly mounted on the outer end of the gudgeon 38 by means of a stud 54.

Rotation of the feed carriage about the gudgeons is prevented by means of a link 56, the upper end of which is pivotally connected to the rear of the carriage by a stud 58, while the lower end is pivotally connected to the machine frame by stud 60. The link 56 extends in a direction substantially at right angles to the line of feed and lies in a plane substantially to the rear of the gudgeons 36 and 38, with the result that there is no appreciable rocking movement of the feed carriage during its advancing and retracting movements, and therefore but a slight Vertical movement of the front or work engaging portion of the feed carriage.

To move the carriage in the line of feed, the gudgeon 36 at the left of the carriage is connected to one arm of a suitably actuated lever 62. By making connection of the actuating mechanism to the feed carriage at this point, the force tending to move the carriage along the line of feed is exerted directly along the bearing surfaces of the supporting gudgeons. This arrangement, together with the pivotally mounted link 56 for preventing rotation of the carriage about the gudgeons, substantially reduces frictional resistance and eliminates any tendency of the carriage to bind during feeding due to racking or twisting of the carriage. As a result, great accuracy in feeding movement is obtained and the parts supported by the carriage 34 are effectively actuated.

The arm of the feed carriage actuating lever 62 which cooperates with the end of the gudgeon 3G is formed at its end with two vertical Separated forked portions 64 and 66, between the ends of which are slidable a pair of blocks 68 and '10. The blocks are pivotally mounted upon a vertical pin '|2 secured within the end of the gudgeon 38 (Figs. 4 and 6). The lever 62 is mounted on a vertical shaft 14 in the frame and is provided with a laterally extending arm pivotally connected by a link 16 with a lever '18. rlhe lever 'i8 is supported on a horizontal shaft 80 carried by the machine frame and the lever is formed with an elongated hub carrying a pair of arms 82 pivotally connected one at each side to an open oscillating frame 84. The frame 84 carries a cam roll 86 cooperating with a cam on the sewing cam shaft I0 and is pivotally connected by means of a pin 88 with the lower end 0f a link 90, the upper end of which is rotatably mounted on a stud 92 secured in one extremity vof a yoke member 94. When the sewing shaft is rotated, the frame 84 is rocked about the shaft 80 and stud 92 as centers, the arms 82 and link 00 acting as guides for the movement of the frame. The link 9) and that portion of frame 84 between pin 88 and the pivotal connection of arms 82 comprise a pair of toggle members for driving the feed slide, the relative position of stud 02 determining the amount of movement imparted to the feed slide.

The needle and awl are mounted on toothed segments 06 and 08 for oscillating movements about a carrier stud |00, which is arranged for reciprocating movement in the line of feed to enable the work to be fed by the needle during the retracting movement of the feed carriage and while the presser-foot is raised from the work. The right hand end of the stud |00 is supported for rotational and sliding movement in a plain bearing |02 in the machine frame, while the left hand end of the stud is received in a threaded bearing |04 on the feed carriage 34, the end of the stud being threaded to engage the threads of said bearing, as described in further detail in inventors Patent No. 2,031,479 issued February 18, 1936.

To impart feeding movements to the carrier stud |00, the stud is oscillated by means of a gear segment |06 formed on the 4stud and engaging a corresponding segment |08 (see Fig. 5) secured to one end of a shaft ||0 loosely mounted in the machine frame. To actuate the segment |08, at the other end of the shaft ||0 there is clamped an arm l |2 pivotally connected by means of a link I4 with a second open oscillating frame 6. On the link H4 there is mounted a roll ||8 engaged between the forked portions of a plate |20 rigidly mounted on the shaft 80 and a shaft |22 supported in a fixed bearing in the machine. The frame I6 is mounted at its lower end on a pin |24 carried by a link |26 rotatably mounted On a stud |28 secured in the yoke member S4, the stud |28 being secured in the outer end of the opposite arm of the yoke member from the stud 92. The frame ||6 carries a cam follower |30 engaging a cam on the main sewing shaft |0 so that when the sewing shaft is rotated the frame is oscillated about the stud |28 while being guided by the roll ||8 between the forked portions of the plate |20 and by the link |26. The link |26 and that portion of the frame H6 between pin |24 and the pivotal connection of link ||4 comprise a pair of toggle members for oscillating the carrier stud |00, the relative position of stud |28 determining the amount of feeding movement imparted to the needle and awl.

To enable the operator readily to adjust the rate of feeding movement imparted to the work, mechanism is provided by which adjustment of the separate feeding movements of the feed carriage and of the needle may be effected simultaneously from a single control handle |32 mounted at the right hand side of the machine (see Figs. l, 2 and 3). The handle |32 is rotatably supported upon a horizontal stud |34 in the main frame, and is provided at its lower end with a grip |36 by which the handle may be swung forwardly or rearwardly as desired.

The connections between the control handle |32 and the feed mechanism comprise a plate |38 (see Figs. 1, 2 and 3) pivotally mounted on a stud shaft 46 secured in a bracket |42 carried by the machine frame. The shaft |40 is arrange-d with its axis in alignment with the axis of the stud |34 on which the handle is mounted. When the handle is moved towards the rear it engages a lip |44 at the lower end of the plate |38 and when it is moved forwardly a laterally extending pin |46 on the handle engages the inner end of a bolt |48 adjustably clamped within a slot in the plate |38. The plate |38 is also formed with an arcuate slot |56 in which is adjustably clamped a bolt |52, the inner en-d of which passes loosely through the forward end of a link |54. The rearward end of the link |54 is connected with the lower end of an arm |56 mounted at one end of a horizontal shaft |58 (see Fig. 2). The shaft |58 extends loosely through suitable bearings in the lower part of the sewing head and at its other end is pinned to one side of the yoke member 94, to the extremities of which the cam actuated frames 84 and l i6 are connected. The other side of the yoke member is rotatably mounted on a stub shaft |60 carried by the head in alignment with the shaft E58. When the shaft |58 is rotated the positions of studs S2 and l22 at the ends of the arms of the yoke member are changed so as to change simultaneously the distance through which the feed carriage 34 and the needle and awl Stud itl@ are moved.

When the control handle is moved to its rearward position the plate l38 is moved in a direction to shorten the feeding movements of the feed carriage and the needle and awl stud. When the control handle is moved to the other extreme position, the plate ESE will be moved to lengthen the f-eeding movements. To retain the plate 38 in position after adjusting the length of feed at one end of the handle movement, in the lower end of the bracket U32 there is loosely mounted a bolt H52 passing through an arcuate slot in the plate i353. The bolt H52 is surrounded by a spring lE-i (see Fig. 2) compressed between the bracket 62 and a thumb nut H86 to provide friction of the stud in the slot of the plate E33 and prevent its movement while the machine is operated. If desired, the thumb nut le@ may be tightened. to prevent any movement of the plate 38, thus holding the feed adjustment xed during the operation of the machine.

The nature and scope of the present invention having been indicated, and a specific embodiment illustrating the several features having been described, what is claimed is:

l. A sewing machine having, in combination, a main frame7 stitch forming and work feeding devices including a feed carriage, a guide on the frame extending in the direction of work feed for supporting the carriage, and a link extending substantially at right angles to the direction of iced connecting the carriage with the frame and preventing pivotal movement of the carriage about the guide as a center.

2. A sewing machine having, in combination, a main frame, stitch forming and work feeding devices including a feed carriage, a guide on the frame extending in the direction of work feed, a projection on the carriage slidably supported in the guide, a link extending at substantially right angles to the direction of feed connecting the carriage with the frame and preventing pivotal movement of the carriage about the guide as a center, and mechanism connected to the projection for reciprocating the carriage to feed the work.

3. A sewing machine having, in combination7 a main frame, stitch forming and work feeding devices including a feed carriage, means for reciprocating the carriage along the line of feed, gudgeons for supporting and guiding the carriage extending in axial alignment in opposite directions from the carriage, and a link pivotally connected at one end to the carriage and at the other end to the machine frame and extending substantially at right angles to the direction of feed for preventing pivotal movement of the carriage about the axis of the gudgeons.

4. A sewing machine having, in combination, stitch forming and work feeding devices, a main sewing cam shaft for actuating said devices, a carriage movable in the line of feed for supporting certain of said devices, carriage reciprocating mechanism comprising a pair f toggle members and a cam follower secured to one of said members and actuated by a cam on the sewing shaft, and adjusting means for changing the position of the center about which the other member of said pair is moved.

5. A sewing machine having, in combination, a carriage mounted to reciprocate in the line of feed, a work support and a presser foot on the carriage, a screw threaded stud engaging a threaded bearing in the carriage, needle and awl segments mounted on the stud, mechanisms for reciprocating the carriage and for oscillating said stud to impart a continuous feeding movement to the work, and adjusting means common to said mechanisms for changing simultaneously the feeding movement of the carriage and the oscillating movement of said stud.

6. A sewing machine having, in combination, stitch forming and work feeding devices, a main sewing cam shaft for actuating said devices, a carriage and a stud relatively movable in the line of feed for supporting said devices, mechanisms for reciprocating the carriage and stud along the line of feed to impart a continuous feeding movement to the work, each of said mechanisms comprising a pair of toggle members and a cam follower secured to one of asid members and actuated by a cam on said sewing shaft, and adjusting means common to both pairs of toggle members for changing simultaneously the positions of the centers about which said members are moved.

7. A sewing machine having, in combination,-

stitch forming and work feeding devices, a main sewing cam shaft for actuating said devices, a carriage and a stud relatively movable in the line of feed for supporting said devices, mechanisms for reciprocating the carriage and stud along the line of feed to impart a continuous feeding movement to the work, each of said mechanisms comprising a pair of toggle members and a cam follower secured to one of said members and actuated by a cam on said sewing shaft, a yoke for pivotally supporting the other of each pair of toggle members, and means for changing the position of the yoke to increase or decrease the distances through which the carriage and stud are moved.

OTTO R. HAAS. 

